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Systemd/src/network/networkd-network.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <ctype.h>
#include <net/if.h>
#include "conf-files.h"
#include "conf-parser.h"
#include "util.h"
#include "networkd.h"
#include "networkd-netdev.h"
#include "networkd-link.h"
#include "network-internal.h"
static int network_load_one(Manager *manager, const char *filename) {
_cleanup_network_free_ Network *network = NULL;
_cleanup_fclose_ FILE *file = NULL;
char *d;
Route *route;
Address *address;
int r;
assert(manager);
assert(filename);
file = fopen(filename, "re");
if (!file) {
if (errno == ENOENT)
return 0;
else
return -errno;
}
if (null_or_empty_fd(fileno(file))) {
log_debug("Skipping empty file: %s", filename);
return 0;
}
network = new0(Network, 1);
if (!network)
return log_oom();
network->manager = manager;
LIST_HEAD_INIT(network->static_addresses);
LIST_HEAD_INIT(network->static_routes);
LIST_HEAD_INIT(network->static_fdb_entries);
network->stacked_netdevs = hashmap_new(&string_hash_ops);
if (!network->stacked_netdevs)
return log_oom();
network->addresses_by_section = hashmap_new(NULL);
if (!network->addresses_by_section)
return log_oom();
network->routes_by_section = hashmap_new(NULL);
if (!network->routes_by_section)
return log_oom();
network->fdb_entries_by_section = hashmap_new(NULL);
if (!network->fdb_entries_by_section)
return log_oom();
network->filename = strdup(filename);
if (!network->filename)
return log_oom();
network->name = strdup(basename(filename));
if (!network->name)
return log_oom();
d = strrchr(network->name, '.');
if (!d)
return -EINVAL;
assert(streq(d, ".network"));
*d = '\0';
network->dhcp = ADDRESS_FAMILY_NO;
network->dhcp_ntp = true;
network->dhcp_dns = true;
network->dhcp_hostname = true;
network->dhcp_routes = true;
network->dhcp_sendhost = true;
network->dhcp_route_metric = DHCP_ROUTE_METRIC;
network->dhcp_client_identifier = DHCP_CLIENT_ID_DUID;
network->llmnr = LLMNR_SUPPORT_YES;
network->link_local = ADDRESS_FAMILY_IPV6;
r = config_parse(NULL, filename, file,
"Match\0"
"Link\0"
"Network\0"
"Address\0"
"Route\0"
"DHCP\0"
"DHCPv4\0"
"Bridge\0"
"BridgeFDB\0",
config_item_perf_lookup, network_network_gperf_lookup,
false, false, true, network);
if (r < 0)
return r;
/* IPMasquerade=yes implies IPForward=yes */
if (network->ip_masquerade)
network->ip_forward |= ADDRESS_FAMILY_IPV4;
LIST_PREPEND(networks, manager->networks, network);
r = hashmap_ensure_allocated(&manager->networks_by_name, &string_hash_ops);
if (r < 0)
return r;
r = hashmap_put(manager->networks_by_name, network->name, network);
if (r < 0)
return r;
LIST_FOREACH(routes, route, network->static_routes) {
if (!route->family) {
log_warning("Route section without Gateway field configured in %s. "
"Ignoring", filename);
return 0;
}
}
LIST_FOREACH(addresses, address, network->static_addresses) {
if (!address->family) {
log_warning("Address section without Address field configured in %s. "
"Ignoring", filename);
return 0;
}
}
network = NULL;
return 0;
}
int network_load(Manager *manager) {
Network *network;
_cleanup_strv_free_ char **files = NULL;
char **f;
int r;
assert(manager);
while ((network = manager->networks))
network_free(network);
r = conf_files_list_strv(&files, ".network", NULL, network_dirs);
if (r < 0)
return log_error_errno(r, "Failed to enumerate network files: %m");
STRV_FOREACH_BACKWARDS(f, files) {
r = network_load_one(manager, *f);
if (r < 0)
return r;
}
return 0;
}
void network_free(Network *network) {
NetDev *netdev;
Route *route;
Address *address;
FdbEntry *fdb_entry;
Iterator i;
if (!network)
return;
free(network->filename);
free(network->match_mac);
strv_free(network->match_path);
strv_free(network->match_driver);
strv_free(network->match_type);
strv_free(network->match_name);
free(network->description);
free(network->dhcp_vendor_class_identifier);
free(network->mac);
strv_free(network->ntp);
strv_free(network->dns);
strv_free(network->domains);
strv_free(network->bind_carrier);
netdev_unref(network->bridge);
netdev_unref(network->bond);
HASHMAP_FOREACH(netdev, network->stacked_netdevs, i) {
hashmap_remove(network->stacked_netdevs, netdev->ifname);
netdev_unref(netdev);
}
hashmap_free(network->stacked_netdevs);
while ((route = network->static_routes))
route_free(route);
while ((address = network->static_addresses))
address_free(address);
while ((fdb_entry = network->static_fdb_entries))
fdb_entry_free(fdb_entry);
hashmap_free(network->addresses_by_section);
hashmap_free(network->routes_by_section);
hashmap_free(network->fdb_entries_by_section);
if (network->manager) {
if (network->manager->networks)
LIST_REMOVE(networks, network->manager->networks, network);
if (network->manager->networks_by_name)
hashmap_remove(network->manager->networks_by_name, network->name);
}
free(network->name);
condition_free_list(network->match_host);
condition_free_list(network->match_virt);
condition_free_list(network->match_kernel);
condition_free_list(network->match_arch);
free(network);
}
int network_get_by_name(Manager *manager, const char *name, Network **ret) {
Network *network;
assert(manager);
assert(name);
assert(ret);
network = hashmap_get(manager->networks_by_name, name);
if (!network)
return -ENOENT;
*ret = network;
return 0;
}
int network_get(Manager *manager, struct udev_device *device,
const char *ifname, const struct ether_addr *address,
Network **ret) {
Network *network;
struct udev_device *parent;
const char *path, *parent_driver, *driver, *devtype;
assert(manager);
assert(ret);
assert(device);
path = udev_device_get_property_value(device, "ID_PATH");
parent = udev_device_get_parent(device);
if (parent)
parent_driver = udev_device_get_driver(parent);
else
parent_driver = NULL;
driver = udev_device_get_property_value(device, "ID_NET_DRIVER");
devtype = udev_device_get_devtype(device);
LIST_FOREACH(networks, network, manager->networks) {
if (net_match_config(network->match_mac, network->match_path,
network->match_driver, network->match_type,
network->match_name, network->match_host,
network->match_virt, network->match_kernel,
network->match_arch,
address, path, parent_driver, driver,
devtype, ifname)) {
if (network->match_name) {
const char *attr;
uint8_t name_assign_type = NET_NAME_UNKNOWN;
attr = udev_device_get_sysattr_value(device, "name_assign_type");
if (attr)
(void) safe_atou8(attr, &name_assign_type);
if (name_assign_type == NET_NAME_ENUM)
log_warning("%-*s: found matching network '%s', based on potentially unpredictable ifname",
IFNAMSIZ, ifname, network->filename);
else
log_debug("%-*s: found matching network '%s'", IFNAMSIZ, ifname, network->filename);
} else
log_debug("%-*s: found matching network '%s'", IFNAMSIZ, ifname, network->filename);
*ret = network;
return 0;
}
}
*ret = NULL;
return -ENOENT;
}
int network_apply(Manager *manager, Network *network, Link *link) {
int r;
link->network = network;
if (network->ipv4ll_route) {
Route *route;
r = route_new_static(network, 0, &route);
if (r < 0)
return r;
r = inet_pton(AF_INET, "169.254.0.0", &route->dst_addr.in);
if (r == 0)
return -EINVAL;
if (r < 0)
return -errno;
route->family = AF_INET;
route->dst_prefixlen = 16;
route->scope = RT_SCOPE_LINK;
route->metrics = IPV4LL_ROUTE_METRIC;
route->protocol = RTPROT_STATIC;
}
if (network->dns || network->ntp) {
r = link_save(link);
if (r < 0)
return r;
}
return 0;
}
int config_parse_netdev(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_free_ char *kind_string = NULL;
char *p;
NetDev *netdev;
NetDevKind kind;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
kind_string = strdup(lvalue);
if (!kind_string)
return log_oom();
/* the keys are CamelCase versions of the kind */
for (p = kind_string; *p; p++)
*p = tolower(*p);
kind = netdev_kind_from_string(kind_string);
if (kind == _NETDEV_KIND_INVALID) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Invalid NetDev kind: %s", lvalue);
return 0;
}
r = netdev_get(network->manager, rvalue, &netdev);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"%s could not be found, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
if (netdev->kind != kind) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"NetDev is not a %s, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
switch (kind) {
case NETDEV_KIND_BRIDGE:
network->bridge = netdev;
break;
case NETDEV_KIND_BOND:
network->bond = netdev;
break;
case NETDEV_KIND_VLAN:
case NETDEV_KIND_MACVLAN:
case NETDEV_KIND_IPVLAN:
case NETDEV_KIND_VXLAN:
r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Can not add VLAN '%s' to network: %s",
rvalue, strerror(-r));
return 0;
}
break;
default:
assert_not_reached("Can not parse NetDev");
}
netdev_ref(netdev);
return 0;
}
int config_parse_domains(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
char ***domains = data;
char **domain;
int r;
r = config_parse_strv(unit, filename, line, section, section_line,
lvalue, ltype, rvalue, domains, userdata);
if (r < 0)
return r;
strv_uniq(*domains);
network->wildcard_domain = !!strv_find(*domains, "*");
STRV_FOREACH(domain, *domains) {
if (is_localhost(*domain))
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "'localhost' domain names may not be configured, ignoring assignment: %s", *domain);
else if (!hostname_is_valid(*domain)) {
if (!streq(*domain, "*"))
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "domain name is not valid, ignoring assignment: %s", *domain);
} else
continue;
strv_remove(*domains, *domain);
/* We removed one entry, make sure we don't skip the next one */
domain--;
}
return 0;
}
int config_parse_tunnel(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
NetDev *netdev;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = netdev_get(network->manager, rvalue, &netdev);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Tunnel is invalid, ignoring assignment: %s", rvalue);
return 0;
}
if (netdev->kind != NETDEV_KIND_IPIP &&
netdev->kind != NETDEV_KIND_SIT &&
netdev->kind != NETDEV_KIND_GRE &&
netdev->kind != NETDEV_KIND_GRETAP &&
netdev->kind != NETDEV_KIND_IP6GRE &&
netdev->kind != NETDEV_KIND_IP6GRETAP &&
netdev->kind != NETDEV_KIND_VTI &&
netdev->kind != NETDEV_KIND_IP6TNL
) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"NetDev is not a tunnel, ignoring assignment: %s", rvalue);
return 0;
}
r = hashmap_put(network->stacked_netdevs, netdev->ifname, netdev);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Can not add VLAN '%s' to network: %s",
rvalue, strerror(-r));
return 0;
}
netdev_ref(netdev);
return 0;
}
int config_parse_ipv4ll(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
AddressFamilyBoolean *link_local = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
/* Note that this is mostly like
* config_parse_address_family_boolean(), except that it
* applies only to IPv4 */
if (parse_boolean(rvalue))
*link_local |= ADDRESS_FAMILY_IPV4;
else
*link_local &= ~ADDRESS_FAMILY_IPV4;
return 0;
}
int config_parse_dhcp(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
AddressFamilyBoolean *dhcp = data, s;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
/* Note that this is mostly like
* config_parse_address_family_boolean(), except that it
* understands some old names for the enum values */
s = address_family_boolean_from_string(rvalue);
if (s < 0) {
/* Previously, we had a slightly different enum here,
* support its values for compatbility. */
if (streq(rvalue, "none"))
s = ADDRESS_FAMILY_NO;
else if (streq(rvalue, "v4"))
s = ADDRESS_FAMILY_IPV4;
else if (streq(rvalue, "v6"))
s = ADDRESS_FAMILY_IPV6;
else if (streq(rvalue, "both"))
s = ADDRESS_FAMILY_YES;
else {
log_syntax(unit, LOG_ERR, filename, line, s, "Failed to parse DHCP option, ignoring: %s", rvalue);
return 0;
}
}
*dhcp = s;
return 0;
}
static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
[DHCP_CLIENT_ID_MAC] = "mac",
[DHCP_CLIENT_ID_DUID] = "duid"
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DCHPClientIdentifier);
DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DCHPClientIdentifier, "Failed to parse client identifier type");
static const char* const llmnr_support_table[_LLMNR_SUPPORT_MAX] = {
[LLMNR_SUPPORT_NO] = "no",
[LLMNR_SUPPORT_YES] = "yes",
[LLMNR_SUPPORT_RESOLVE] = "resolve",
};
DEFINE_STRING_TABLE_LOOKUP(llmnr_support, LLMNRSupport);
int config_parse_llmnr(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
LLMNRSupport *llmnr = data;
int k;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(llmnr);
/* Our enum shall be a superset of booleans, hence first try
* to parse as boolean, and then as enum */
k = parse_boolean(rvalue);
if (k > 0)
*llmnr = LLMNR_SUPPORT_YES;
else if (k == 0)
*llmnr = LLMNR_SUPPORT_NO;
else {
LLMNRSupport s;
s = llmnr_support_from_string(rvalue);
if (s < 0){
log_syntax(unit, LOG_ERR, filename, line, -s, "Failed to parse LLMNR option, ignoring: %s", rvalue);
return 0;
}
*llmnr = s;
}
return 0;
}
int config_parse_ipv6token(
const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
union in_addr_union buffer;
struct in6_addr *token = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(token);
r = in_addr_from_string(AF_INET6, rvalue, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, -r, "Failed to parse IPv6 token, ignoring: %s", rvalue);
return 0;
}
r = in_addr_is_null(AF_INET6, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, -r, "IPv6 token can not be the ANY address, ignoring: %s", rvalue);
return 0;
}
if ((buffer.in6.s6_addr32[0] | buffer.in6.s6_addr32[1]) != 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "IPv6 token can not be longer than 64 bits, ignoring: %s", rvalue);
return 0;
}
*token = buffer.in6;
return 0;
}
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